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Date: Thu, 05 Mar 2009 09:04:36 +0800 From: "Zhang, Yanmin" <yanmin_zhang@...ux.intel.com> To: David Miller <davem@...emloft.net> Cc: herbert@...dor.apana.org.au, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, jesse.brandeburg@...el.com, shemminger@...tta.com Subject: Re: [RFC v1] hand off skb list to other cpu to submit to upper layer On Wed, 2009-03-04 at 01:39 -0800, David Miller wrote: > From: "Zhang, Yanmin" <yanmin_zhang@...ux.intel.com> > Date: Wed, 04 Mar 2009 17:27:48 +0800 > > > Both the new skb_record_rx_queue and current kernel have an > > assumption on multi-queue. The assumption is it's best to send out > > packets from the TX of the same number of queue like the one of RX > > if the receved packets are related to the out packets. Or more > > direct speaking is we need send packets on the same cpu on which we > > receive them. The start point is that could reduce skb and data > > cache miss. > > We have to use the same TX queue for all packets for the same > connection flow (same src/dst IP address and ports) otherwise > we introduce reordering. > Herbert brought this up, now I have explicitly brought this up, > and you cannot ignore this issue. Thanks. Stephen Hemminger brought it up and explained what reorder is. I answered in a reply (sorry for not clear) that mostly we need spread packets among RX/TX in a 1:1 mapping or N:1 mapping. For example, all packets received from RX 8 will be spreaded to TX 0 always. > > You must not knowingly reorder packets, and using different TX > queues for packets within the same flow does that. Thanks for you rexplanation which is really consistent with Stephen's speaking. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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